Microsoft wants users to actually use Office 2007
 

MICROSOFT SAYS its upcoming revamp of its Office product will be so easy to use, customers may begin to use more than twenty percent of its functions.
Up until now, Volish research suggests that people use only about twenty percent of the features crammed into the apps they use. Quite why they buy it, then, is anyone’s guess.

I'm wondering if it works with current XP.